... experience manufacter 5.quick reply Introduction: 20%-80% Alumina Content Porous Ceramic Balls also called filtering balls. It is made ... balls are divided into 12 grades by reference to Al2O3 content varied from 25% to 80%, and every more 5% ... Φ3,Φ6,Φ8,Φ10,Φ13,Φ16,Φ20,Φ25,Φ30,Φ38,Φ50 and Φ75. The products in other grade and sizes ... if to the user's request. 20%-80% alumina content Porous Ceramic Ball